Door-securing mechanism



Nqv. 27, 1928.

E. E. GAGE DOOR SECURING MECHANISM Filed Dec. 16, 1925 Patented Nov. 27, 1928.

UNETED STATES EDWARD E. GAGE, OF NEW YORK, N. Y.

DOOR-SECURING MEOHANISM.

Application filed December 16, 1925,

This invention relates to door securing means and more particularly to sliding bolt locks of the double throw type and its object is to increase the security of such locks and add to the convenience of operation by simple and easily added modifications.

In accordance with one feature of this invention, a standard form of lock not equipped with the dead lock feature. may have this feature provided with but slight change in the existing mechanism and without providing additional parts. This advantage is provided by so Constructing the parts that sufficient lost motion is produced between the sliding bolt and the rotating key operated parts that when the bolt is slid home to the limit of its locking movement, the key may be withdrawn without reverse movement of the locking mechanism and the bolt will be dead locked against operation except by the key.

For added security the mechanism of the lock is so modified that the vertical latch which ordinarily serves to retain the bolt in a fully withdrawn position may also serve to retain the bolt in its fully operated position and against operation by a key in the hands of unauthorized persons.

A. third feature relates to retaining means operative when the door is unlocked from the outside with the key to restrain the bolt against spring action tending to return it thereby leaving the hand of the operator free to operate any other latching mechanism and rendering the opening of the door a one handed operation.

In the drawings illustrating this invention:

Fig. 1 is a view in front elevation of a lock embodying the features of this invention;

Fig. 2 is a cross sectional view taken upon line 2-2 of Fig. 1;

Fig. 3 is a longitudinal sectional view taken upon line 3-3 of Fig. 2;

Fig. i is a longitudinal sectional view upon the reverse side of the lock to that of Fig. 3 with the bolt withdrawn;

Fig. 5 is a longitudinal sectional view similar to Fig. 4 with the bolt` in an operated position;

Fig. 6 is an exploded view of the key operated mechanism;

Fig. 7 is a detailed enlarged view of the lost motion connection for the key operated spindle. f

As shown in the drawings, 5 designates a Serial No. 75,850.

casing which houses a sliding bolt 6 adapted to be moved into and out of engagement with a socket 7 mounted on the side of the door casing. On its end which is permanently within the casing 57 the bolt 6 is provided with a shank 8 having a lateral apertured projection 9 thereon and a longitudinal extending portion 10 having a cam 11 thereon provided with a straight face 12 and angular face 13. Extending through the lateral apertured portion 9 is a rod 15 supported between two projecting bracket members 16 and 17 carried byy a plate 18 slidable in ways formed in the interior of the casing 5. A coiled operating spring 2O surrounding the rod 15 bears at one end against the bracket member 17 and has its other end in engagement with the inner face of the lateral apertured proj ection 9 on the shank 8. The spring 2O tends normally to move the bolt 6 into a latching position.

A knob 21 located outside the casing 5 has a reduced shank portion 22 journaled in an .annular housing 23 within the casing 6 and has secured to its inner end to rotate therewith a ring shaped member 24 carrying two angularly disposed operating fingers 25 and 26. The :linger 25 is curved and adapted to engage the straight face 12 of the cam 1l, as shown in Fig. 4: to withdraw the bolt 6 from the socket 7. The finger 26, which is rectangular in shape, is adapted to engage the angular face 13 of the cam 11 to move the bolt 6 into its fully extended or locked position in which position it can be returned only by the reverse turning of the'knob 21 from the inside of the door or by means of a key 30 from the outside of the door as will be subsequently explained in detail. In this position of the part-s which is illustrated in Fig. 5, the'plate 18 carrying the bracket members 16 and 17 will be moved forwardly of the casing 5 and the spring 20 will be in its fully extended position. With the parts in this position, pressure upon the end of the bolt 6 will be ineffective to return it into the casing, thereby insuring the lock against forcing it by jimmying. As additional security a vertically movable slide 32 operable by means of a projecting lug 'extending through the front of the casing, is provided with a bolt retaining projection which is adapted to engage the front end of the shank portion 8 as in Fig. 4 to retain the bolt in a fully withdrawn position and the rear end of the shank 8 to prevent the boltl being operated by the key and to oder additional resistance to jimmying. rFhis feature also affords security to the occupants in such cases as keys to the particular lock may be in the possession of unauthorized holders.

Referring now to the key operated mechanism it will be noted t-hat there is provided the ordinary tumbler operated mechanism in which a rotatable barrel 40 is released by the insertion of the key and is adapted to be turned thereby. Secured to the inner end of the barrel is a plate 4l having two oppositely located screw threaded openings 42 and 43 adapted to receive screws 44 and 45 in a plate 46 having an opening` 47 through which rotatably extends a squared stem 48 that eX- tends through the door and into the casing 5. Secured to one end oi the stem 48 is a rectangular plate 49 provided with notches 50 and 5l through which the screws 44 and extend, the distance between opposite sides of the notches and 5l being su'liicient to permit approximately a quarter turn of the key and barrel before turning of the stem 48 takes place.

Secured to the inner end of the stem 48 and within the casing 5 is a collar 55 upon which is carried a projecting lug 56 adapted to engage a corresponding projecting lug 57 carried by the ring shaped member 24 mounted on the shank 22 operated by the knob 2l.

Provided in the periphery oit the collar is a depression 58 adapted to be engaged by a spring pressed pin 59 in one position of the key and in such positions of the parts the bolt 6 is retained in a fully retracted position against the tension of the spring 20, thereby leaving free the key hand to operate knobs or other latching mechanism. rlhe position of the key in this operation is slightly beyond the limit of its movement for withdrawing the bolt 6 to its fully retracted position and therefore slightly beyond its position of withdrawal from the lock so that in order to withdraw it from the lock a slight turn in the opposite direction is required and this movement is just suflicient to release the spring pressed pin 59 and permit the spring operation of the bolt.

We have previously traced the operation of the parts when operat-ed from the inside oif the door. The operation through the agency of the key 30 will now be described.

Upon leaving the premises and closing` the door, the bolt 6 which will in such cases ordinarily be in its halt way or latching position and will be snapped into the socket 7 by the closing of the door. The key 30 is then inserted and turned toward t-he door casing, the iirst or preliminary movement being to take the lost play between the screws 44 and 45 and the notches 50 and 51 oi the plate 49. Att-er this motion is taken up, the projection 56 on the collar 55 will engage the projection 57 on the member 44 and rotate the locking ,cee

mechanism into the position shown in Fig. 5 in which position the key 30, due to the lost motion provided between the barrel 40 and the stem 48 will be in a position of withdrawal irom the lock. Also in this position of the parts and upon the withdrawal of the key, the bolt G will be securely retained against forcin g by pressure upon the end and it will also be retained against operation by knob 2l lfrom the inside thereby renderingl futile attempts to opening it by sawing out a portion of the panel and reaching inside the door.

rlhe forward movement of the member 24 is limited by a stop screw GO secured in a boss 6l in the casing 5 and against which the curved linger 25 bears when the bolt 6 is in iull locking position.

The vertically movable slide 32 is adapted to be retained in its operated positions by a springr operated plunger G5 which engages notches 66 and 67 in the edge of said slide 32.

lWh at is claimed is l. ln a door securing mechanism, a securing bolt, a casing within which said bolt is housed, a rotatable member within said housfor moving said bolt into and out 0.1i operating position, a. key operated tumbler lock mechanism including a rotatable barrel, a stem connected with said rotatable member, an apertured plate through which said stem extends, screws for securing` said apertured plate to the barrel and a notched plate secured to the end of the stem cooperating with said screws to provide a lost motion connection between the stem and the barrel whereby the movement of the key to move the bolt into a 'fully extended position will bring said key into a position of withdrawal from the lock and leave the bolt in a dead locked position.

2. In a door securing mechanism, a securing bolt, spring actuating means normally tending to retain the bolt in a latching position, key operated means for moving said bolt against the action of said spring` into a position of withdrawal and means cooperating with said key operated means while the key is in the lock ior retaining the bolt in its it'ully withdrawn position against the action of the spring actuating mechanism.

ln a. door securing mechanism, a securing` bolt, spring actuating` mechanism normally tend ing to retain the bolt in a latching position. key operated mechanism including a rotatable collar for moving said bolt into a fully withdrawn position and retaining means cooperating with the rotatable collar in response to a further movement of the key beyond its position of withdrawal to retain said bolt in a fully withdrawn' position against the action ot its returning spring.

4. In adoor securing mechanism, a securing bolt, spring actuating mechanism normally tending to retain the bolt in a latchin position, key operated means including` a rotatable collar provided with a depression in its periphery for moving said bolt into a turning the key into its position for Withully Withdrawn position, a spring operated drawal.

retaining member adapted to engage the de- In Witness whereof, I hereunto`l subscribe pression in the collar by a 'further movement my name this 11 day of December, A. D., 5 of the key when the bolt is moved to its fully 1925.

withdrawn position by means of the key operated mechanism released therefrom by EDWARD E. GAGE. 

